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I've travelled US-20 (in Idaho) from the
Western Border where it joins I-84 to Rexburg. The portion from
Mountain Home to Idaho Falls was known as Goodale's Cutoff, a shortcut
on the Oregon Trail skirting the basalt lava fields rather than following
the Snake River.

Along the way is Craters of the Moon NM and the Idaho National Engineering
Laboratory, the birthplace of the Nuclear Navy. EBR-1 (Experimental Breeder
Reactor-1), now a seasonally operated museum, is open to the public.